CN105385125A - Polylactic acid/cellobiose blend material and preparation method thereof - Google Patents
Polylactic acid/cellobiose blend material and preparation method thereof Download PDFInfo
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- CN105385125A CN105385125A CN201510916154.XA CN201510916154A CN105385125A CN 105385125 A CN105385125 A CN 105385125A CN 201510916154 A CN201510916154 A CN 201510916154A CN 105385125 A CN105385125 A CN 105385125A
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/15—Heterocyclic compounds having oxygen in the ring
- C08K5/151—Heterocyclic compounds having oxygen in the ring having one oxygen atom in the ring
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- C08J3/00—Processes of treating or compounding macromolecular substances
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- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
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Abstract
The invention discloses a cellobiose modified polylactic acid blend material. The blend material comprises 99.9-0.1 mass% of polylactic acid and 0.1-99.9 mass% of cellobiose. A preparation method of the blend material comprises the following steps: keeping the temperature unchanged in a range of 20-150DEG C to make raw materials comprising cellobiose and polylactic acid be completely dissolved in dimethyl sulfoxide (DMSO) and N,N-dimethyl acetamide (DMAc) as a solvent in order to prepare a polylactic acid/cellobiose blended solution; carrying out vacuum drying on the blended solution at 20-150DEG C to completely remove the solvent in order to obtain a cellobiose modified polylactic acid blend; and carrying out extruding granulation on the blend to obtain the cellobiose modified polylactic acid blend material. The polylactic acid can be a homopolymer or a copolymer of L-lactic acid and D-lactic acid, or a blend thereof.
Description
Technical field:
The invention belongs to technical field of polymer materials, be specifically related to blend material of cellobiose polydactyl acid and its preparation method and application.
Background technology:
Poly(lactic acid) (PLA) is linear aliphatic race thermoplastic polyester, can be obtained, or rac-Lactide ring-opening polymerization obtains by Pfansteihl direct melt polycondensation.Pfansteihl obtains by renewable resources (as W-Gum, Mierocrystalline cellulose etc.) fermentation.PLA is raw material with biomass resource, has broken away from the dependence to petroleum resources.The premium propertiess such as poly(lactic acid) biodegradable, biocompatibility and good mechanical property, comprise.Therefore, PLA is widely used at biomedical sector, as medical implant, suture line and drug delivery system etc.In addition, PLA is also for the field such as wrapping material, plastics film.PLA can adopt extrude, the hot plastic processing method such as injection molding processes.The second-order transition temperature of PLA is 55 ~ 65 DEG C, and PLA material fragility when room temperature is large, and wetting ability is poor, reduces the biocompatibility etc. of it and other materials.And pure PLA resin crystallization velocity is very slow, moulded products shrinking percentage is large, poor dimensional stability, and processing heat stability is poor, goods poor durability.These performance shortcomings limit the application of poly-lactic acid material in plastic material field.Therefore, in order to expand its Application Areas, poly-lactic acid material must carry out modification, and conventional method of modifying comprises modification by copolymerization method and blending and modifying.Wherein, utilizing and carry out blending and modifying to poly(lactic acid), by the polymer blending of different performance, can improve the performance of polymkeric substance significantly, is one of simple effective ways improving poly(lactic acid) performance.The blending and modifying of poly(lactic acid) is mixed by a certain percentage poly(lactic acid) and another kind of material, the blend of gained except there is poly(lactic acid) and the intrinsic premium properties of another material, also may between two kinds of components certain synergistic effect and present new effect.Poly(lactic acid) and hydrophilic monomer or polymkeric substance are as blended in monose, disaccharides, polyoxyethylene glycol, poly-peptide and polyose etc., introduce hydroaropic substance, can improve the biocompatibility of material, regulate its degradation rate in hydrophobic poly(lactic acid).
Cellobiose is biomass resource, is the one of numerous renewable resources, and abundant raw material, has affinity to human body cell, by it and polylactic acid blend, can improve the biocompatibility of material.And cellobiose molecule has a hemiacetal hydroxyl, and cellobiose contains a large amount of hydrophilic radicals, with hydrophobic polylactic acid blend, the wetting ability of poly-lactic acid material can be improved, improve the over-all properties of material, expand its Application Areas.The weak point of cellobiose does not possess enough mechanical properties and processing characteristics.In addition, extensively there is occurring in nature with the Mierocrystalline cellulose that β-Isosorbide-5-Nitrae-glycosidic link is connected to form in D-cellobiose monomer, therefore wide material sources.But, utilize the research of cellobiose polydactyl acid have not been reported.
The research of glucide polydactyl acid causes concern day by day.ChenC etc. are with acetic acid-dimethyl sulfoxide (DMSO) (DMSO) for the PLLA/ chitosan blend thing of different ratio prepared by solvent, and analytical results shows, in PLLA/ chitosan blend, defines hydrogen bond between the hydroxyl of PLLA molecule and the amino of chitosan molecule.Along with the raising of chitosan content, the Tm of blend and degree of crystallinity decline (JoumalofEuropeanPolymer, 2005,41 (5): 958-966.) to some extent compared to pure PLLA.Park etc. carry out blended with PLA after the glycerine of starch different content is carried out gelatinization again.The gelatinization of starch destroys the crystallization between starch granules, reduces the degree of crystallinity of starch, enhances the cohesiveness (PolymerEngineering & Science, 2000,40:2539-2550.) between starch and PLA interface.Qu Ping etc. adopt solution casting method to prepare the nano-cellulose/lactic acid composite material of Wholly-degradable, the viscosity of co-mixing system is along with the increase of nano-cellulose massfraction after tested, in non-linear growth, for partially compatible system, and material surface has the vestige (modern chemical industry be obviously etched after degraded in soil, 2011,31:221-224.).But, the blending and modifying of currently used most of polysaccharose substance and poly(lactic acid), and have no report about the research of cellobiose blending and modifying poly(lactic acid).
In the last few years, along with the minimizing of oil and coal reserves, and China had the Biological resources of abundant lactic acid class, can substitute petroleum chemicals.Cellobiose is the product of cellulose hydrolysis, and abundant raw material source.Meanwhile, cellobiose contains a large amount of hydrophilic radicals, with hydrophobic polylactic acid blend, can improve the wetting ability of poly-lactic acid material, improves the over-all properties of material, expands its application in the field such as medical material and plastic wrapping.
Summary of the invention:
The object of the invention is the performance deficiency for poly(lactic acid), select hydrophilic material blended with it, the consistency of both research, thus improve hard and crisp character, wetting ability and the cellular affinity of poly(lactic acid), and then a kind of preparation method of poly(lactic acid)/cellobiose blend material of efficient, environmental protection is provided, the blend of gained has good consistency, processing characteristics and other performances.
Realize the technical scheme that the object of the invention adopts as follows:
The preparation method of poly(lactic acid)/cellobiose blend: the present invention with cellobiose and poly(lactic acid) for raw material, with dimethyl sulfoxide (DMSO) (DMSO), N, N-N,N-DIMETHYLACETAMIDE (DMAc) is solvent, adopt solution blending process, preparation poly(lactic acid)/cellobiose blend material, gained blend component comprises the cellobiose of 0.1 ~ 99.9% weight content and the poly(lactic acid) of 99.9 ~ 0.1% weight contents.
The step of preparation process of described poly(lactic acid)/cellobiose blend solution comprises: joined by cellobiose in DMSO solvent, stirs, dissolve completely to cellobiose at 20 ~ 150 DEG C of constant temperature.The poly(lactic acid) being 0.1 ~ 99.9% by the massfraction occupying poly(lactic acid)/cellobiose blend adds in this solution, stir at 20 ~ 150 DEG C of constant temperature, dissolve completely to poly(lactic acid), obtain poly(lactic acid)/cellobiose blend solution, the mass concentration of the DMSO solution of cellobiose and poly(lactic acid) is 0.1 ~ 50%.Blend solution is evaporated under 20 ~ 150 DEG C of vacuum conditions, solvent is evaporated completely, reclaim dimethyl sulfoxide (DMSO), obtain cellobiose and polylactic acid blend.The blend of gained is through granulation and after vacuum-drying, obtain poly(lactic acid)/cellobiose blend material.
Further, described poly(lactic acid)/cellobiose blend solution also can adopt the following step to prepare: cellobiose, poly(lactic acid) are added in proportion in DMSO simultaneously, after being heated to 20 ~ 150 DEG C, constant temperature is to dissolving completely, obtains poly(lactic acid)/cellobiose blend solution.
Further, described poly(lactic acid)/cellobiose blend solution also can adopt the following step to prepare: cellobiose, poly(lactic acid) are dissolved in respectively in DMSO, again by the cellobiose solution of gained, PLA solution mixing, obtain poly(lactic acid)/cellobiose blend solution.
Further, described poly(lactic acid)/cellobiose blend solution also can adopt the following step to prepare: poly(lactic acid) be dissolved in DMSO, be heated to constant temperature after certain temperature, to dissolving completely, add cellobiose again, being heated to constant temperature after certain temperature, to dissolving completely, obtaining poly(lactic acid)/cellobiose blend solution.
Further, described cellobiose and polylactic acid blend also can adopt the following step to prepare: poured into by poly(lactic acid)/cellobiose blend solution in a certain amount of methyl alcohol and produce precipitation.Suction filtration precipitation separation.The throw out obtained by suction filtration is normal pressure or vacuum-drying 0.5 ~ 24 hour at 20 ~ 150 DEG C, namely obtains poly(lactic acid)/cellobiose blend.
Further, described poly(lactic acid) is homopolymer, the multipolymer of Pfansteihl and D-ALPHA-Hydroxypropionic acid, or the blend of arbitrary proportion between poly(lactic acid) homopolymer, between poly(lactic acid) homopolymer and multipolymer.
Further, the solvent of described poly(lactic acid)/cellobiose blend can also be the mixed solvent of N,N-dimethylacetamide (DMAc) or N,N-dimethylacetamide (DMAc) and dimethyl sulfoxide (DMSO) (DMSO).
Further, the methods such as described cellobiose and polylactic acid blend solution can be taked to be coated with, flow casting molding, extrusion moulding are carried out shaping.
Further, the DMSO waste liquid that production process produces, can reclaiming, thus reduces production cost and environmental pollution.
The present invention adopts the mode of solution blending to prepare cellobiose and polylactic acid blend, and technique is simple, and cellobiose raw material abundance, forming method are simple.Cellobiose of the present invention and polylactic acid blend have the features such as consistency is good, cost is low, environmental pollution is little, environmentally degradable.
Embodiment:
Below in conjunction with specific embodiment, technical scheme of the present invention is described further.According to following embodiment, the present invention may be better understood.But concrete material proportion, processing condition and result thereof described by embodiment are only for illustration of the present invention, and embodiment not limits scope of the present invention.
Embodiment 1:
0.1 part of cellobiose is joined in 20 parts of dimethyl sulfoxide (DMSO) (DMSO), under agitation be warming up to 20 DEG C and dissolve 1 and littlely to dissolve completely up to cellobiose, add the poly (l-lactic acid) (PLLA) that 9 parts of number average mol weights are 80,000 again, and be warming up to 150 DEG C, continue to be stirred to PLLA, cellobiose dissolves completely, obtain blended liquid.By this blended liquid under 50 DEG C of vacuum, solvent is evaporated completely, obtain poly(lactic acid)/cellobiose blend material.
Embodiment 2:
1 part of cellobiose is joined 20 parts of dimethyl sulfoxide (DMSO) (DMSO), under agitation be warming up to 20 DEG C and dissolve 10 and littlely to dissolve completely up to cellobiose, add the poly (l-lactic acid) (PLLA) that 1 part of number average mol weight is 80,000 again, continue to be stirred to PLLA, cellobiose dissolves completely, obtain blended liquid.Be coated with on constant temp. heating sheet glass by this blended liquid and scrape film forming, be evaporated to gel at normal temperatures and pressures, the blend film of gained, 50 DEG C of vacuum-dryings 10 hours, obtains poly(lactic acid)/cellobiose blend material.
Embodiment 3:
5 parts of cellobioses are joined 50 parts of dimethyl sulfoxide (DMSO) (DMSO), under agitation be warming up to 50 DEG C and dissolve 8 and littlely to dissolve completely up to cellobiose, add the poly (l-lactic acid) (PLLA) that 15 parts of number average mol weights are 80,000 again, continue to be stirred to PLLA, cellobiose dissolves completely, obtain blended liquid.By this blended liquid under 60 DEG C of vacuum, solvent is evaporated completely, obtain poly(lactic acid)/cellobiose blend material.
Embodiment 4:
1 part of cellobiose is joined 50 parts of dimethyl sulfoxide (DMSO) (DMSO), under agitation be warming up to 30 DEG C and dissolve 1 and littlely to dissolve completely up to cellobiose, add the poly (l-lactic acid) (PLLA) that 1 part of number average mol weight is 30,000 again, and be warming up to 90 DEG C, continue to be stirred to PLLA, cellobiose dissolves completely, obtain blended liquid.This blended liquid is dropwise added drop-wise in methanol solvate, obtains floss, suction filtration precipitation separation.The throw out obtained by suction filtration vacuum-drying 24 hours at 50 DEG C, namely obtain poly(lactic acid)/cellobiose blend material, the fusing point of this blend material is 150 DEG C.
Embodiment 5:
9 parts of cellobioses are joined in 20 parts of dimethyl sulfoxide (DMSO) (DMSO), under agitation be warming up to 50 DEG C and dissolve 2 and littlely to dissolve completely up to cellobiose, add the poly (l-lactic acid) (PLLA) that 0.1 part of number average mol weight is 30,000 again, and be warming up to 100 DEG C, continue to be stirred to PLLA, cellobiose dissolves completely, obtain blended liquid.By this blended liquid under 40 DEG C of vacuum, solvent is evaporated completely, obtain cellobiose/poly (l-lactic acid) blend material.
Embodiment 6:
10 parts of cellobioses are joined in 50 parts of dimethyl sulfoxide (DMSO) (DMSO), under agitation be warming up to 80 DEG C and dissolve 1 and littlely to dissolve completely up to cellobiose, add the poly (l-lactic acid) (PLLA) that 0.1 part of number average mol weight is 30,000 again, and be warming up to 100 DEG C, continue to be stirred to PLLA, cellobiose dissolves completely, obtain blended liquid.Be coated with on constant temp. heating sheet glass by this blended liquid and scrape film forming, be evaporated to gel at normal temperatures and pressures, the blend film of gained, 50 DEG C of vacuum-dryings 24 hours, obtains cellobiose/poly (l-lactic acid) blend material.
Embodiment 7:
1 part of cellobiose is joined in 20 parts of dimethyl sulfoxide (DMSO) (DMSO), be under agitation warming up to 30 DEG C and dissolve 1 and littlely to dissolve completely up to cellobiose.By 1 part of number average mol weight be 100,000 poly (l-lactic acid) (PLLA) add in 20 parts of DMSO, be under agitation warming up to 80 DEG C and dissolve completely to PLLA.The cellobiose solution of gained, PLLA solution are mixed, continues stirring 1 hour, obtain poly(lactic acid)/cellobiose blended liquid.By this blended liquid under 60 DEG C of vacuum, solvent is evaporated completely, obtain cellobiose/poly (l-lactic acid) blend material.
Embodiment 8:
10 parts of cellobioses are joined in 30 parts of dimethyl sulfoxide (DMSO) (DMSO), be under agitation warming up to 80 DEG C and dissolve 1 and littlely to dissolve completely up to cellobiose.By 10 parts of number average mol weights be 100,000 poly (l-lactic acid) (PLLA) add in 15 parts of DMAc, be under agitation warming up to 90 DEG C and dissolve completely to PLLA.The cellobiose solution of gained, PLLA solution are mixed, continues stirring 1 hour, obtain poly(lactic acid)/cellobiose blended liquid.This blended liquid is dropwise added drop-wise in methanol solvate, obtains floss, suction filtration precipitation separation.The throw out obtained by suction filtration vacuum-drying 12 hours at 60 DEG C, namely obtains poly(lactic acid)/cellobiose blend material.
Embodiment 9:
2 parts of cellobioses are joined in 20 parts of dimethyl sulfoxide (DMSO) (DMSO), be under agitation warming up to 60 DEG C and dissolve 1 and littlely to dissolve completely up to cellobiose.By 2 parts of number average mol weights be 100,000 poly (l-lactic acid) (PLLA) add in 10 parts of DMAc, be under agitation warming up to 90 DEG C and dissolve completely to PLLA.The cellobiose solution of gained, PLLA solution are mixed, 50 DEG C are continued stirring 1 hour, obtain poly(lactic acid)/cellobiose blended liquid.This blend solution is evaporated to gel at normal temperatures and pressures, extrusion moulding, by extrudate 50 DEG C of vacuum-dryings 12 hours, obtains poly(lactic acid)/cellobiose blend material.
Embodiment 10:
The poly (l-lactic acid) (PLLA) being 100,000 by 1 part of cellobiose and 1 part of number average mol weight adds in 50 parts of dimethyl sulfoxide (DMSO) (DMSO) simultaneously, under agitation be warming up to 120 DEG C, be stirred to PLLA, cellobiose dissolves completely, obtain blended liquid.By this blended liquid under 120 DEG C of vacuum, solvent is evaporated completely, obtain poly(lactic acid)/cellobiose blend material.
Embodiment 11:
By 2 parts of number average mol weights be 200,000 poly (l-lactic acid) (PLLA) cellobiose add in 50 parts of dimethyl sulfoxide (DMSO) (DMSO), be warming up to 100 DEG C to dissolve completely to poly(lactic acid), add 2 parts of cellobioses again, continue to be stirred to PLLA, cellobiose dissolves completely, obtain blended liquid.By this blended liquid under 70 DEG C of vacuum, solvent is evaporated completely, obtain poly(lactic acid)/cellobiose blend material.
Embodiment 12
2 parts of cellobioses are joined in 20 parts of dimethyl sulfoxide (DMSO) (DMSO), under agitation be warming up to 50 DEG C and dissolve 1 and littlely to dissolve completely up to cellobiose, add the poly (l-lactic acid) (PLLA) that 2 parts of number average mol weights are 200,000 again, and be warming up to 150 DEG C, continue to be stirred to PLLA, cellobiose dissolves completely, obtain blended liquid.By this blended liquid under 40 DEG C of vacuum, evaporated completely by solvent, obtain cellobiose/poly (l-lactic acid) blend material, the fusing point of this blend material is 156 DEG C.
Embodiment 13
2 parts of cellobioses are joined in 100 parts of N-methylmorpholine-N-oxide compound (NMMO) aqueous solution, under agitation be warming up to 60 DEG C and dissolve 1 and littlely to dissolve completely up to cellobiose, be the poly (l-lactic acid) (PLLA) of 200,000 again by 38 parts of number average mol weights, under agitation be warming up to 150 DEG C, continue to be stirred to PLLA, cellobiose dissolves completely, obtain blended liquid.This blended liquid is coated with on constant temp. heating sheet glass and scrapes film forming, by sheet glass methanol solvate, suction filtration to blend membrane.By blend membrane 60 DEG C of vacuum-dryings 18 hours, obtain poly(lactic acid)/cellobiose blend material.
Embodiment 14
1 part of cellobiose is joined 4 parts of dimethyl sulfoxide (DMSO) (DMSO), under agitation be warming up to 80 DEG C and dissolve 1 and littlely to dissolve completely up to cellobiose, add the poly (l-lactic acid) (PLLA) that 1 part of number average mol weight is 250,000 again, and be warming up to 150 DEG C, continue to be stirred to PLLA, cellobiose dissolves completely, obtain blended liquid.This blend solution is evaporated to gel at normal temperatures and pressures, after 95 DEG C of vacuum-dryings 6 hours, obtain poly(lactic acid)/cellobiose blend material.
Embodiment 15
10 parts of cellobioses are joined 10 parts of dimethyl sulfoxide (DMSO) (DMSO), be under agitation warming up to 80 DEG C and dissolve 3 and littlely to dissolve completely up to cellobiose.By 10 parts of number average mol weights be 250,000 poly (l-lactic acid) (PLLA) join in 40 parts of DMAc solvents, be under agitation warming up to 130 DEG C, dissolve completely to PLLA.The cellobiose solution of gained, PLLA solution are mixed, 40 DEG C are continued stirring 1 hour, obtain poly(lactic acid)/cellobiose blended liquid.This blended liquid is coated with on constant temp. heating sheet glass and scrapes film forming, and sheet glass is immersed in methanol solvate, be precipitated, suction filtration precipitation separation.The throw out obtained by suction filtration vacuum-drying 12 hours at 50 DEG C, namely obtains poly(lactic acid)/cellobiose blend material.
Embodiment 16
The poly (l-lactic acid) (PLLA) being 250,000 by 1 part of cellobiose and 1 part of number average mol weight adds in 25 parts of dimethyl sulfoxide (DMSO) (DMSO) simultaneously, under agitation be warming up to 120 DEG C, be stirred to PLLA, cellobiose dissolves completely, obtain blended liquid.By this blended liquid under 60 DEG C of vacuum, solvent is evaporated completely, obtain poly(lactic acid)/cellobiose blend material.
Embodiment 17
19 parts of cellobioses are joined 50 parts of dimethyl sulfoxide (DMSO) (DMSO), under agitation be warming up to 30 DEG C and dissolve 4 and littlely to dissolve completely up to cellobiose, add the poly (l-lactic acid) (PLLA) that 1 part of number average mol weight is 30,000 again, and be warming up to 90 DEG C, continue to be stirred to PLLA, cellobiose dissolves completely, obtain blended liquid.This blended liquid is dropwise added drop-wise in methanol solvate, obtains floss, suction filtration precipitation separation.By the throw out extrusion moulding obtained, extrudate, 60 DEG C of vacuum-dryings 10 hours, obtains poly(lactic acid)/cellobiose blend material.
Embodiment 18:
10 parts of cellobioses are joined in 50 parts of dimethyl sulfoxide (DMSO) (DMSO), under agitation be warming up to 80 DEG C and dissolve 1 and littlely to dissolve completely up to cellobiose, add the poly-D-ALPHA-Hydroxypropionic acid (PDLA) that 10 parts of number average mol weights are the poly (l-lactic acid) (PLLA) of 100,000,10 parts of number average mol weights are 150,000 again, and be warming up to 100 DEG C, continue to be stirred to PLLA, PDLA, cellobiose dissolves completely, obtain blended liquid.Be coated with on constant temp. heating sheet glass by this blended liquid and scrape film forming, be evaporated to gel at normal temperatures and pressures, the blend film of gained, 50 DEG C of vacuum-dryings 24 hours, obtains cellobiose/polylactic acid coblended matter material.
Embodiment 19:
10 parts of cellobioses are joined the N of 20 parts of dimethyl sulfoxide (DMSO) (DMSO) and 30 parts, in the mixed solvent of N-N,N-DIMETHYLACETAMIDE (DMAc), under agitation be warming up to 80 DEG C and dissolve 1 and littlely to dissolve completely up to cellobiose, add the poly-D that 10 parts of number average mol weights are the poly (l-lactic acid) (PLLA) of 100,000,1 part of number average mol weight is 100,000 again, Pfansteihl (PDLLA), and be warming up to 100 DEG C, continue to be stirred to PLLA, PDLA, cellobiose dissolves completely, obtain blended liquid.Be coated with on constant temp. heating sheet glass by this blended liquid and scrape film forming, be evaporated to gel at normal temperatures and pressures, the blend film of gained, 50 DEG C of vacuum-dryings 24 hours, obtains cellobiose/polylactic acid coblended matter material.
Claims (8)
1. a blend for poly(lactic acid) and cellobiose, is characterized in that: in described blend, and the mass content of poly(lactic acid) is 99.9 ~ 0.1%, and the mass content of cellobiose is 0.1 ~ 99.9%.
2. cellobiose according to claim 1 and polylactic acid blend, it is characterized in that: prepare poly(lactic acid)/cellobiose intermingling material with poly(lactic acid)/cellobiose blend solution, poly(lactic acid)/cellobiose blend solution realizes with the following step: cellobiose is joined dimethyl sulfoxide (DMSO) (DMSO) or N, in N-N,N-DIMETHYLACETAMIDE (DMAc) solvent, be stirred to cellobiose at 20 ~ 150 DEG C of constant temperature and dissolve completely; Poly(lactic acid) added in this solution subsequently, constant temperature is stirred to poly(lactic acid) and dissolves completely, obtains poly(lactic acid)/cellobiose blend solution; By this blend solution 20 ~ 150 DEG C of vacuum-dryings, desolvation, obtains cellobiose and polylactic acid blend; The blend of gained is through granulation and after vacuum-drying, obtain poly(lactic acid)/cellobiose blend material.
3. poly(lactic acid) according to claim 2/cellobiose blend solution, it is characterized in that: described poly(lactic acid)/cellobiose mixing solutions also can adopt following three kinds of modes to prepare: 1) cellobiose, poly(lactic acid) are joined in solvent simultaneously, be heated to 20 ~ 150 DEG C of constant temperature, dissolve completely to cellobiose, poly(lactic acid), obtain blend solution; 2) cellobiose, poly(lactic acid) are dissolved in solvent respectively, are heated to 20 ~ 150 DEG C of constant temperature, dissolve completely, then by the cellobiose solution of gained, PLA solution mixing, obtain blend solution; 3) join in solvent by poly(lactic acid), be heated to 20 ~ 150 DEG C of constant temperature, dissolve completely, then add cellobiose to poly(lactic acid), constant temperature dissolves completely to cellobiose, poly(lactic acid), obtains blend solution.
4. poly(lactic acid) according to claim 2/cellobiose blend solution, it is characterized in that: removing of described solvent, also following steps can be adopted: poured into by poly(lactic acid)/cellobiose blend solution in a certain amount of methyl alcohol and produce precipitation, suction filtration precipitation separation again, finally by the throw out vacuum-drying of suction filtration gained, namely obtain poly(lactic acid)/cellobiose blend.
5. cellobiose according to claim 1 and polylactic acid blend, is characterized in that: poly(lactic acid) is the homopolymer of Pfansteihl and D-ALPHA-Hydroxypropionic acid, multipolymer or the blend between them.
6. poly(lactic acid) according to claim 2/cellobiose blend solution, it is characterized in that: described solvent can be dimethyl sulfoxide (DMSO) (DMSO) and N, any one of N-N,N-DIMETHYLACETAMIDE (DMAc), or the mixture of both arbitrary proportions.
7. poly(lactic acid) according to claim 2/cellobiose blend solution, is characterized in that: the concentration of the poly(lactic acid)/cellobiose blend solution of gained is 0.1 ~ 50%.
8. poly(lactic acid) according to claim 2/cellobiose blend solution, is characterized in that: described poly(lactic acid)/cellobiose blend solution also can be taked to extrude, curtain coating, coating process carry out shaping.Mold compound can prepare cellobiose and polylactic acid blend pellet further.
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| CN106496987A (en) * | 2016-12-09 | 2017-03-15 | 南京林业大学 | A kind of polylactic acid/cellooligosaccharide blend material and preparation method thereof |
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Application publication date: 20160309 |